1828861 has 4 divisors (see below), whose sum is σ = 1849500. Its totient is φ = 1808224.

The previous prime is 1828847. The next prime is 1828867. The reversal of 1828861 is 1688281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1688281 = 7 ⋅241183.

It can be written as a sum of positive squares in 2 ways, for example, as 1196836 + 632025 = 1094^2 + 795^2 .

It is a cyclic number.

It is not a de Polignac number, because 1828861 - 2⁵ = 1828829 is a prime.

It is a Duffinian number.

1828861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1828867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10186 + ... + 10363.

It is an arithmetic number, because the mean of its divisors is an integer number (462375).

2^1828861 is an apocalyptic number.

It is an amenable number.

1828861 is a deficient number, since it is larger than the sum of its proper divisors (20639).

1828861 is an equidigital number, since it uses as much as digits as its factorization.

1828861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20638.

The product of its digits is 6144, while the sum is 34.

The square root of 1828861 is about 1352.3538738067. The cubic root of 1828861 is about 122.2907381067.

The spelling of 1828861 in words is "one million, eight hundred twenty-eight thousand, eight hundred sixty-one".